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Generation of an isolated sub-30 attosecond pulse in a two-color laser field and a static electric field |
| Zhang Gang-Tai(张刚台)a)†, Bai Ting-Ting(白婷婷)b), and Zhang Mei-Guang(张美光) a) |
a. Department of Physics and Information Technology, Baoji University of Arts and Sciences, Baoji 721016, China;
b. Department of Mathematics, Baoji University of Arts and Sciences, Baoji 721013, China |
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Abstract We theoretically investigate high-order harmonic generation (HHG) from a helium ion model in a two-color laser field, which is synthesized by a fundamental pulse and its second harmonic pulse. It is shown that a supercontinuum spectrum can be generated in the two-color field. However, the spectral intensity is very low, limiting the application of the generated attosecond (as) pulse. By adding a static electric field to the synthesized two-color field, not only is the ionization yield of electrons contributing to the harmonic emission remarkably increased, but also the quantum paths of the HHG can be significantly modulated. As a result, the extension and enhancement of the supercontinuum spectrum are achieved, producing an intense isolated 26-as pulse with a bandwidth of about 170.5 eV. In particular, we also analyse the influence of the laser parameters on the ultrabroad supercontinuum spectrum and isolated sub-30-as pulse generation.
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Received: 18 October 2011
Revised: 27 April 2012
Accepted manuscript online:
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PACS:
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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| Fund: Project supported by the Science Foundation of Baoji University of Arts and Sciences, China (Grant Nos. ZK10122, ZK11061, ZK11135, ZK11060, and ZK1032) and the Education Committee Natural Science Foundation of Shaanxi Province, China (Grant No. 2010JK405). |
Cite this article:
Zhang Gang-Tai(张刚台), Bai Ting-Ting(白婷婷), and Zhang Mei-Guang(张美光) Generation of an isolated sub-30 attosecond pulse in a two-color laser field and a static electric field 2012 Chin. Phys. B 21 054214
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